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This is the Bringer of the Blue Death

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If this card is discarded by card effect and sent to the GY: You can add 1 Level 5 or higher Dark World monster from your Deck to your hand, except Reign-Beaux, Supreme Overlord of Dark World, then, if it was discarded by your opponent, you can Special Summon 1 Level 4 or lower Dark World monster from your Deck or GY to either field

In Modern, it fits well into self-mill strategies given the landfall ability will help bring it back

I created two design rules for these cards: The creature sides should just have an enters ability and an activated ability to transform